condition mean min max ZT0-3 0.19882850000000002 0.19882850000000002 0.19882850000000002 ZT4-7 0.150917 0.150917 0.150917 ZT8-11 0.2766005 0.2766005 0.2766005 ZT12-15 0.3795665 0.3795665 0.3795665 ZT16-19 0.4701335 0.4701335 0.4701335 ZT20-23 0.3149785 0.3149785 0.3149785